Rewrite the following sentences as directed in parentheses

rewrite the following sentences as directed in parentheses
1. The bicycle has only a wheel. it is often used at the circus (use relative pronoun)
2. Do you know the man? he sat next to me last night (use relative pronoun)
3. The house is very beatiful, so i want to buy it (use relative pronoun)
4. i want to help this boy because he is very poor (use relative pronoun)